# Umfpack lib usually requires linking to a blas library.
# It is up to the user of this module to find a BLAS and link to it.

if (UMFPACK_INCLUDES AND UMFPACK_LIBRARIES)
    set(UMFPACK_FIND_QUIETLY TRUE)
endif ()

find_path(UMFPACK_INCLUDES
  NAMES
      umfpack.h
  HINTS 
      ../../_build_env/include # for conda
      ${EXTERNAL_DIR}/include 
      $ENV{EXTERNAL_DIR}/include
  PATHS
      ../../_build_env/include # for conda
      $ENV{UMFPACKDIR}
      ${INCLUDE_INSTALL_DIR}
  PATH_SUFFIXES
      suitesparse
      ufsparse
)

message(STATUS "UMFPACK_INCLUDES    : ${UMFPACK_INCLUDES}")

find_library(UMFPACK_LIBRARIES umfpack 
    HINTS 
        ../../_build_env/lib # for conda
        ${EXTERNAL_DIR}/lib
    PATHS 
        ../../_build_env/lib # for conda
        ${EXTERNAL_DIR}
        $ENV{UMFPACKDIR} 
        ${LIB_INSTALL_DIR}
        
    PATH_SUFFIXES
        lib
)

message(STATUS "UMFPACK_LIBRARIES    : ${UMFPACK_LIBRARIES}")

# if (NOT UMFPACK_LIBRARIES)
#     if(EXISTS ${EXTERNAL_DIR}/lib/libumfpack.a)
#         set(UMFPACK_LIBRARIES ${EXTERNAL_DIR}/lib/libumfpack.a)
#     endif()
# endif()

if(0 AND UMFPACK_LIBRARIES)

  if (NOT UMFPACK_LIBDIR)
      get_filename_component(UMFPACK_LIBDIR ${UMFPACK_LIBRARIES} PATH)
  endif(NOT UMFPACK_LIBDIR)

  find_library(COLAMD_LIBRARY colamd 
      PATHS 
          ${UMFPACK_LIBDIR} 
          $ENV{UMFPACKDIR} 
          ${LIB_INSTALL_DIR}
  )

  if (COLAMD_LIBRARY)
      set(UMFPACK_LIBRARIES ${UMFPACK_LIBRARIES} ${COLAMD_LIBRARY})
  endif (COLAMD_LIBRARY)
  
  find_library(AMD_LIBRARY amd PATHS ${UMFPACK_LIBDIR} $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
  if (AMD_LIBRARY)
    set(UMFPACK_LIBRARIES ${UMFPACK_LIBRARIES} ${AMD_LIBRARY})
  endif (AMD_LIBRARY)

  find_library(SUITESPARSE_LIBRARY SuiteSparse PATHS ${UMFPACK_LIBDIR} $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
  if (SUITESPARSE_LIBRARY)
    set(UMFPACK_LIBRARIES ${UMFPACK_LIBRARIES} ${SUITESPARSE_LIBRARY})
  endif (SUITESPARSE_LIBRARY)

    message(STATUS "UMFPACK_LIBRARIES: ${UMFPACK_LIBRARIES}")
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(UMFPACK DEFAULT_MSG
                                  UMFPACK_INCLUDES UMFPACK_LIBRARIES)

mark_as_advanced(UMFPACK_INCLUDES UMFPACK_LIBRARIES AMD_LIBRARY COLAMD_LIBRARY SUITESPARSE_LIBRARY)